Generally speaking, the size of a bank card is 85.60 mm in length and 53.98 mm in width. The entire length-to-width ratio is 4:3.

Bank cards refer to credit payment instruments issued to the public by approved commercial banks (including postal financial institutions) with all or part of the functions of consumer credit, transfer settlement, cash deposits and withdrawals, etc. Bank cards reduce the circulation of cash and checks, allowing banking business to break through the limitations of time and space and undergo fundamental changes. The application of the bank card automatic settlement system will make a "checkless, cashless society" a reality.

Bank cards are divided into credit cards and debit cards. The following is the detailed information of the bank card:

1. Debit card

Debit card is issued to the society by the issuing bank and has the functions of transfer settlement, cash deposit and withdrawal, shopping and consumption, etc. credit tools. Most of the salary cards that friends usually use are debit cards.

2. Quasi-credit card

Quasi-credit card is also a credit card with "Chinese characteristics". It was created when my country's credit mechanism was not yet complete. The emergence and development of credit cards have laid a foundation that cannot be ignored for the popularity of credit cards.

A quasi-credit card has some functions of both a credit card and a debit card. Generally, you need to pay a deposit or provide a guarantor. When using it, you deposit first and then spend. Interest is calculated on the deposit, which can be used for shopping and consumption. Make a small overdraft within the limit approved by the card-issuing bank, but interest will be accrued on the overdraft amount from the date of overdraft. The outstanding balance must be paid off in one go. There is no interest-free repayment period and minimum repayment amount.

3. Credit card

A credit card is a credit card in the narrow sense that we often refer to. It is a payment card that provides consumer credit to cardholders. People can "buy first, settle and pay later" without depositing money at the card-issuing bank.

The core features are credit sales and revolving credit. Generally, the card issuing bank sends a bill to the cardholder once a month. Within a certain grace period after receiving the bill, the cardholder can choose to pay off the account without paying interest; or pay part of the account, or only pay Minimum payment, plus interest later.